8-6 Electromagnetic Compatibility (EMC) Rexroth IndraDrive
DOK-INDRV*-SYSTEM*****-PR02-EN-P
Measures to Reduce Noise Emission
To reduce noise emission there are mainly three possible measures:
Filtering prevents emission of noise via the lines, especially via the mains
connection (mains filter). For this purpose there are special interference
suppression filters available.
Sufficient metallic shielding prevents radiation into the air. This is
achieved by mounting the devices in a grounded control cabinet or in a
housing (metallic encapsulation). The shielding of line connections is
realized by shielded cables and lines, the shield has to be grounded over
a large surface area.
Grounding discharges interference to ground and makes it flow back to
the source of interference over the shortest distance. Realize grounding
via a sufficiently short connection over the largest possible surface
area in order to achieve low inductive resistance with a low degree of line
inductance. The higher the frequency of disturbances, the lower the line
inductance of grounding has to be.
Note: In ungrounded mains the measure "grounding" cannot be
generally used.
In order to comply with the limit values for noise emission (mainly line-
based radio interference of more than 9 kHz) at the connection points of
the machine or installation, observe the notes on application contained in
this documentation.
8.4 Selecting the Mains Filter
When mains filters are used,
• the allowed limit values of the line-based interference emission can be
complied with in the range of 50 kHz to 30 MHz.
• interference via the mains connection to devices connected near by
(e.g. control unit components) can be reduced.
There are the following criteria for selection of the mains filter; the criteria
are decisively determined by the operating conditions. To select the mains
filter proceed according to the following order:
1. Determine required limit value class for application.
2. Check or determine max. occurring ambient temperature.
3. Determine max. applied mains voltage.
Observe that not all Rexroth IndraDrive mains filters are suited for
mains voltage of 3AC500V.
4. Determine kind of mains connection, such as central supply, group
supply etc. (to do this it is useful to outline involved components and
their interaction).
5. Calculate mains-side continuous current of mains filter.
For selecting components calculate the effective rms value. For
calculation formulas see chapter "Calculations"
6. Select a mains contactor the nominal current of which does not
exceed nominal current of mains filter.
7. Determine number of drive axes, take into account that HMD01 are
equipped with 2 axes.
8. Determine total length of connected motor cables.
Filtering
Shielding
Grounding
Noise Emission of the Drive
Systems
Purpose of Mains Filter
How to Proceed for Selecting the
Mains Filter
Mains-Side Continuous Current
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